In plotly.js, how may I get call a javascript callback called when a slider is changed,

I have found an answer in

It is very tricky. The documentation should provide an example of this common task. If you have many slidders, you should
set a name property for each and check its name as in this code

function handleSliderChange(e) {
let stepLabel = e.step.label
if (sliderName==‘a’)
else if (sliderName==‘b’)

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